For heavy-duty vehicles, the EPA said it's maintaining its previous commitment to a"flexible structure" for commercial vehicles that will"enable manufacturers to achieve compliance efficiently based on the composition of their fleets." As part of that commitment, it expects commercial vehicle manufacturers to embrace not only electrification, but also new transmission technologies, improvements in aerodynamics, and other energy storage methods like hydrogen fuel cells.
The EPA said it expects widespread use of filters to reduce gasoline particulate emissions and wider deployment of CO-reducing technologies for gas-powered vehicles, which to be clear haven't been phased out under the suggested rules.emissions through 2055, equivalent to eliminating all US transportation sector emissions for an entire year.